| 摘要 |
PURPOSE:To improve the magnetic characteristics in terms of the coercive force and the residual magnetic flux density with the application of the magnetic materials of the same component, by pressure-forming of the slurry of two kinds of the Sr system ferrite magnetic powder whose average grain size is different with each other. CONSTITUTION:The cavity 26 is separated into the large part and the small part by the sperating plate 30. The slury of the Sr system ferrite magnetic powder whose average grain size is in the range of 0.9-1.1mum is supplied by applying pressure from the one slurry supplying hole 38. The slurry of the Sr system ferrite magnetic powder whose average grain size is in the range of 0.7-0.85mum is supplied by applying pressure from the other slurry supplying hole 40. Both the slurries are oriented by the intense magnetic field which the exited coil 28 generates. The liquid contained in both the slurries supplied by applying pressure escapes outwards through the filter 34 and the pipe 36 and the pre-forming is performed. The separating plate 30 is brought douen at the right time to be picked out of the cavity 26, and the pressing is continued so that the tightly compacted comporite ferrite magnet before sintering is obtained. |
